A group of students was tasked to investigate how fast sugar dissolved in cold and in hot water. If this going to be fair, what variable should they control?
a. Amount of water and sugar in each cup, method of stirring, time when the solid is added to water, how
long each solution is stirred.
b. Amount of water and sugar in each cup, method of stirring, how long each solution is stirred.
Amount of sugar in each cup, method of stirring, time when the solid is added to water, how long each
solution is stirred.
d. Amount of water in each cup, method of stirring, time when the solid is added to water, how long each
solution is stirred.​